328 PALEONTOLOGY OF NEW YORK. 



Genus PRODUCTELLA, Hall. 1847. 



PLATE XVII, FIGS. 1-9, 16-16. 



Productus i partim) of earlier authoi's. 



1840. Leptcena, 3. dk C. Sowbrbt. Trans. GeoL Society London, vol. v, p. 704, pi. Ivi, fig-. 5. 



1840. Productus (partim), Murchison. Bull. Societe Geol. de Fi-ance, vol. xi, p. 25,'). 



1842. Strophomena, Va.nuxem. Geol. N. Y. Rep. Third Dist., p. 179. 



1842. Strophomena, Conrad. Journ. Acad. Nat. Sci. Phila., vol. viii, p. 25t), pi. xiv, fig. 9. 



1846. Strop>iahsia (partim), KiNQ. Ann. and Mag. Nat. Hist., vol. x viii. 



1854. Productus, Norwood and Pratten. Jour. Acad. Nat. Sci. Phila., vol. iii, p. 21. 



1857. Productus, Hall. Tenth Kept. N. Y. State Cab. Nat. Hist., pp. 172-180. 



1858. Productm, Hall Geo!. Sui-v. Iowa, voL i, part 2, pp. 498-500, 517, 518, pi. iii, figs. 8-10; pi. 



vii, figs. 1, 3, 4. 



1860. Productus, Swallow. Trans. St. Louis Acad. Sci., vol. i, p. 640. 



1861. Productus, Hall. Fourteenth Rept. N. Y. State Cab. Nat. Hist., p. 99. 



1862. Producta, A. Winchell. Proc. Acad. Nat. Sci. Phil., vol. xiv, p. 411. 



1863. Producta, A. Winchell. Ibidem, vol. xv, p. 4 

 1865. Producta, A. Winchell. Ibidem, vol. xvii, p. 114. 



1867. Productella, Hall. Paleontology N. Y., vol. iv, pp. 153-160, 162-184, pi. xxiii, figs. 1-11, 25-49; 



pis. xxiv, XXV and xxvi. 



1867. Productella, Hall. Twentieth Rept. N. Y. State Cab. Nat. Hist., p. 245. 



1868. Producing, Meek and Worthen. Geol. Surv. Illinois, vol. iii, p. 412, pi. x, fig. 3. 

 1870. Productus, A. Winchell. Proc. American Philos. Soc, vol. xii, p. 249. 



1872. Productus (Productella), Hall and Whitfield. Twenty-fourth Rept. N. Y. State Mus. Nat. 



Hist., p. 198. 



1874. Productella. Nicholson. Geological Magazine, n. s., vol. i, p. 118. 



1875. Productus (Productella), Hall and Whitfield. Twenty-seventh Rept. N. Y. State Mus. Nat. 



Hist., explanation pi. ix, figs. 9, 10. 

 1877. Productus, Meek. U. S. Geol. Expl. 40th Parallel, p. 36, pi. iii, fig. 7. 

 1879. Productella, Rathbdn. Proc. Bost. Soc. Nat. Hist., vol. xx, p. 17. 



1883. Productella, Hall. Rept. N. Y. State Geol. for 1882, pi. (xvii) 48, figs. 1-9, 16-46. 



1884. Productus (Productella), Walcott. Pal. Eureka Dist., pp. 128-133, 214, pi. ii, fig. 10 ; pi. vii, 



fig. 2 ; pi. xiii, figs. 8, 9, 18-20. 



1888. Productus, Hbrrick. Bull. Denison Univ., vol. iii, pp. 31-34, pi. iii, figs. 18, 28; pi. vi, fig. 16; 



pi. vii, fig. 18. 



1889. Productella, Nbttelroth. Kentucky Fo.ssil Shells, pp. 69, 70, pi. xvii, figs. 5-9 ; pi. xxvi, fig. 7. 



It is a natural presumption that the earlier forms organized on the pro- 

 ductoid type of structure should retain the cardinal areas and articular pro- 

 cesses of the valves, and it is upon the naturiil persistence of these features in 

 many if not all of the Devonian species that the genus Productella was based. 

 This group was founded on the Productus subaculeatus, Murchison,* a middle 



* This species was identified by M. db Vbrnedil as occurring in the American Devonian rocks near 

 Charleston Landing, Indiana, and the fossil originally figured, as typical Produotki.la, was obtained from 

 near Jefferson, in what was then regarded as the Corniferous limestone, but which later investigations have 

 proved to be the calcareous beds representing the Hamilton group in its western extension. See Pal. N. Y., 

 Vol. V, pt. ii, p. 139 ; " Note on the Hydraulic Beds and Associated Limestones at the Falls of the Ohio." 



